Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 147, Issue -, Pages 508-517Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2013.09.019
Keywords
Aeroxide P25; Tungsten(VI) oxide; Gold nanoparticles; Phenol; UV photodegradation intermediates
Funding
- Romanian National Authority for Scientific Research
- CNCS-UEFISCDI [PN-II-ID-PCE-2011-3-0442]
- Swiss Contribution [SH/7/2/20]
- MNT ERA_NET [7-065/26.09.2012]
- Romanian-Hungarian bilateral project [661/2013/K-TET_12_RO-1-2013-0109966]
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The build-up methodology of a composite photocatalyst is a critical issue regarding the showed photocatalytic performance, including the formation of intermediates. To investigate this issue P25/WO3/Au composites were obtained by impregnation (WO3) and subsequent photoreduction (Au) with UV or visible light. The obtained composites' photocatalytic activity and intermediate formation profiles were evaluated using phenol as a model pollutant. XPS/UPS and DRS methods were used to uncover local coordination, surface chemistry (of the different types of atoms (Ti, W, O and Au) and the band-structure (band-gap, possible electron transitions) of the obtained nanomaterials. The intermediates' evolution profile and structural peculiarities were successfully correlated and it was shown that each minor structural (bulk or surface) change has a significant impact on the photocatalytic activity and intermediate formation dynamics. (C) 2013 Elsevier B.V. All rights reserved.
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